Messages - trymony

Hello! Im having some serious problem with my audio on my chromecast, it's not in sink and the sounds is sparky aswell. I have tried everything on the chromecast website, switching HDMI port restarting the tv, chromecast (even factory reset it) and the router. I have also tried casting from both my computer and Android phone, looked into the advanced installation of the sound for the chromecast. I dont have any speakers to plug into the tv. But the thing is that its a brand new TV and the chromecast worked fine on my old one. No idea what the problem could bee, Also its mostly NETFLIX that has this problem, and playing back for 30 sec doesn't work... nothing works! so frustated...